Next back here at home, new video tonight of a heart pounding event in arkansas. A school bus hijacked, then a heroic bus driver whose quick thinking saved the children in her care. What we learned tonight about this story from abc's gio benitez. Reporter: Police dash cam captures 11 elementary school students running for their lives, one by one escaping a school bus, hijacked by a young man wielding a knife. Sheila hart, the bus driver, remembers the terrifying moment the man came on board. He told me to just shut the door and drive. Reporter: As she took off a mom watching outside called 911. He got on the school bus, with a knife, with the bus driver. Um, I'm so scared. It's okay. Just calm down. Okay? Reporter: With police in hot pursuit, the hijacker took the wheel. Sheila sat behind him trying to calm the frightened kids. My children, they were crying, they were scared. I kept telling them reassuring them they were going to be okay. Reporter: They drove for 20 terrifying minutes, 12 miles, at one point the man himself spoke directly tohe children. He told them, don't do drugs, because this is what happens to you when you do drugs. Reporter: When police finally stopped the bus, sheila distracted the man and her kids bolted out the back. 22-year-old nick miller was arrested on the spot. He's pleaded not guilty. And sheila hart's calm in a crisis made her a local hero. I had one little girl tell me every other day, mrs. Hart you're the best bus driver. So, that makes me feel good. Reporter: Gio benitez, abc news, new york.

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